The design requirements for precision castings are as follows:
1. It should be avoided as much as possible to have large horizontal surfaces inside the casting;
2. The casting holes on the flat wall of the casting should be reinforced with convex edges to reduce wall thickness;
3. The casting structure should be designed to allow for unobstructed shrinkage during cooling;
4. There should be several connecting columns for large interlayer cavities such as water and gas circuits in castings.